Confront consumers with opt-out from caching in Equinox.Cosmos StreamResolver

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As flagged by @jakzale, its critical that consumers be confronted early in the experience with decision making processes around caching and/or unfolds and/or out-of-collection snapshots early in the game.

🤔 we could simply make the caching argument not be optional, at least until #61 is fleshed out more

This also could benefit from more docs/articles and/or tutorials and/or samples ref #57